Split One Row into many based on splitting string in multiple cells - entity-framework

Question

Trying to split one row into many based on string in two cells. it is similar to the question
LINQ to separate column value of a row to different rows in .net
but i need to split based on Product & Cost Columns rather than product column only
SNo.
Product
Cost
1
colgate,closeup,pepsodent
50,100,150
2
rin,surf
100
into
SNo.
Product
Cost
1
colgate
50
1
closeup
100
1
pepsodent
150
2
rin
100
2
surf
100
I'm using Linq to Object with Entity Framework

Answer 1

Try the following. Since you have not presented any model it can be inaccurate in names.
var loaded = ctx.Products.ToList();
var query =
from p in loaded
from sp in p.Product.Split(',').Zip(p.Cost.Split(','), (p, c) => (p, c))
select new
{
Sno = p.Sno,
Product = sp.p,
Cost = sp.c
};
var splitted = query.ToList();

Answer 2

Using #SvyatoslavDanyliv naming, here is an answer:
var loaded = ctx.Products.ToList();
var query =
from p in loaded
from sp in p.Product.Split(',').Zip(p.Cost.Split(','), (p, c) => (p, c))
select new
{
Sno = p.Sno,
Product = sp.p,
Cost = sp.c
};
var splitted = query.ToList();
It feels a bit complicated to me. I would prefer using an extension method to create a variant of Zip that repeats the last element of a shorter sequence to match the longer sequence:
public static class EnumerableExt {
public static IEnumerable<(T1 First,T2 Second)> ZipExtend<T1,T2>(this IEnumerable<T1> s1, IEnumerable<T2> s2) {
var s1e = s1.GetEnumerator();
var s2e = s2.GetEnumerator();
T1 s1eLast = default;
T2 s2eLast = default;
bool has_s2 = false;
if (s1e.MoveNext()) {
do {
s1eLast = s1e.Current;
if (s2e.MoveNext()) {
s2eLast = s2e.Current;
has_s2 = true;
}
else if (!has_s2)
yield break;
yield return (s1eLast, s2eLast);
} while (s1e.MoveNext());
if (has_s2)
while (s2e.MoveNext())
yield return (s1eLast, s2e.Current);
}
yield break;
}
}
Then the answer is:
var query =
from p in loaded
from pr in p.Product.Split(',').ZipExtend(p.Cost.Split(','))
select new
{
Sno = p.Sno,
Product = pr.First,
Cost = pr.Second
};
var splitted = query.ToList();